
* Drop those candidates that have never been in a search
drop if search_tag==.

* Drop if recruiter carries out the next search within less than 10 Seconds 
drop if time_until_next_search<10						// These are around 3,4% of all obs. But almost never the user clicked on a candidate

* Drop all searches where no criteria has been specified
gen s_specified_temp = 0
foreach var of varlist s_job_nr s_job_name s_skills_notes s_workplace_grossregion s_candidate_residence s_workload s_education s_diploma s_experience s_drivers_license s_special_type_of_work s_candidate_availability  s_bn2000_5 s_bn2000_3 s_bn2000_2 s_q93_beruf {
replace s_specified_temp = 1 if `var'!=.
}
bysort search_tag: egen s_specified = max(s_specified_temp)
tab s_specified  				// only 0.34% 
drop if s_specified==0
drop s_specified_temp s_specified

